Shedding light on dark DNA Most textbook definitions of evolution state that it occurs in two stages: mutation followed by natural selection. DNA mutation is a common and continuous process, and occurs completely at random.
The average adult only eats 15 grams of fiber per day. Women need 25 grams of fiber per day, and men need 38 grams per day, according to the Institute of Medicine.
The recommended daily intake of fiber is 20 to 35 grams per day for adults, adolescents, and older children. Desirable fiber intake for children (under 18) is calculated by age plus five grams. For example, a six-year-old needs 11 grams of fiber per day. The average American only gets 10 to 15 grams of fiber per day so most people need to increase their fiber intake.